Grandiflora rose plant named ‘Meizambaizt’

ABSTRACT

A new and distinct variety of Grandiflora rose plant is provided that abundantly and substantially continuously forms attractive double cup-shaped yellow blossoms. The vegetation is very strong. A bushy growth habit is displayed. The foliage is dense dark green with a glossy upper surface. The tolerance to disease is very good, particularly with respect to black spot. The plant is well suited for providing distinctive attractive ornamentation in the landscape.

Botanical/commercial classification: Rosa hybrida/Grandiflora RosePlant.

Varietal denomination: cv. Meizambaizt.

SUMMARY OF THE INVENTION

The new variety of Rosa hybrida Grandiflora rose plant was created inFrance by artificial pollination wherein two parents were crossed whichpreviously had been studied in the hope that they would contribute thedesired characteristics. The female parent (i.e., the seed parent) wasthe product of the cross of the ‘Macivy’ variety (U.S. Plant Pat. No.8,362) and an unnamed and unreleased seedling (non-patented in theUnited States). The male parent (i.e., pollen parent) was the‘Wekamanda’ variety (U.S. Plant Pat. No. 9,591).

The parentage of the new variety can be summarized as follows:(‘Macivy’×Unnamed Seedling)×‘Wekamanda’.

The seeds resulting from the above pollination were sown and smallplants were obtained which were physically and biologically differentfrom each other. Selective study resulted in the identification of asingle plant of the new variety.

It was found that the new Grandiflora rose plant of the presentinvention:

-   -   (a) forms very strong vegetation,    -   (b) exhibits a bushy growth habit with very dense dark green        foliage having a glossy upper surface,    -   (c) abundantly and substantially continuously forms attractive        double cup-shaped yellow blossoms,    -   (d) displays a very good tolerance to disease, and    -   (e) is well suited for providing distinctive attractive        ornamentation in the landscape.

The yellow blossom coloration blends nicely with the dense glossy darkgreen foliage. The tolerance to disease is particularly good withrespect to black spot. The ability to bloom is considered to beexceptional.

The new variety well meets the needs of the horticultural industry andcan be grown to advantage as colorful ornamentation in parks andgardens.

The new variety can be readily distinguished from its ancestors upon aninspection of the blossoms. More specifically, the ‘Macivy’ ancestor isa Floribunda rose that forms red blossoms with some yellow near thebase. The ‘Wekamanda’ male parent variety is a Hybrid Tea rose thatforms light yellow blossoms with a greenish hue on the outer petals whennewly opened.

The new variety has been found to undergo asexual propagation at LeCannet des Maures, Var, France, by a number of routes, includingbudding, grafting, and the use of cuttings. Such asexual propagation bythe above-mentioned techniques has shown that the characteristics of thenew variety are stable and are strictly transmissible by such asexualpropagation from one generation to another. Accordingly, the new varietyundergoes asexual propagation in a true-to-type manner.

The new variety has been named ‘Meizambaizt’.

BRIEF DESCRIPTION OF THE PHOTOGRAPH

The accompanying photograph shows as nearly true as it is reasonablypossible to make the same in a color illustration of this character,typical specimens of plant parts of the new variety. The rose plants ofthe new variety were approximately two years of age and were observedduring October while budded on Rosa laxa rootstock and growing outdoorsat Le Cannet des Maures, Var, France. Standard color information isprovided at the bottom of the photograph for comparative purposes.

FIG. 1 illustrates a specimen of a young shoot;

FIG. 2 illustrates a specimen of a floral bud at the opening of thesepals;

FIG. 3 illustrates a specimen of a floral bud at the further opening ofthe sepals and the initiation of petal opening;

FIG. 4 illustrates a specimen of a floral bud at the further opening ofthe petals;

FIG. 5 illustrates a specimen of a flower in the course of opening;

FIG. 6 illustrates a specimen of an open flower — plan view — obverse;

FIG. 7 illustrates a specimen of an open flower — plan view — reverse;

FIG. 8 illustrates a specimen of a fully open flower — plan view —obverse;

FIG. 9 illustrates a specimen of a fully open flower — plan view —reverse;

FIG. 10 illustrates a specimen of a floral receptacle showingarrangement of the stamens and pistils;

FIG. 11 illustrates a specimen of a floral receptacle showingarrangement of the pistils (stamens removed);

FIG. 12 illustrates a specimen of a main branch;

FIG. 13 illustrates a specimen of a flowering stem;

FIG. 14 illustrates specimens of leaves with 3 leaflets — plan view —upper surface (left) and — under surface (right); and

FIG. 15 illustrates specimens of leaves with 5 leaflets — plan view —upper surface (right) and — under surface (left).

DETAILED DESCRIPTION

The chart used in the identification of the colors is that of The RoyalHorticultural Society (R.H.S. Colour Chart—1995 or equivalent) exceptwhere ordinary color terms are utilized. Common color terms are to beaccorded their customary dictionary significance. The description isbased upon the observation of plants of the new variety at an age ofapproximately two years during the month of May while being grownoutdoors while budded on Rosa laxa rootstock at Le Cannet des Maures,Var, France.

-   Class: Grandiflora.-   Plant:    -   -   Growth habit.—Bushy.-   Branches:    -   -   Color.—Young stems: commonly near Yellow-Green Group 146B            and 146C. Adult wood: commonly near Yellow-Green Group 147B.        -   Thorns.—Configuration: curved downwards and slightly concave            on the under surface with an oval base. On young stems:            commonly absent. Quantity and size on adult stems: commonly            approximately 8 on average having lengths of approximately            1.1 cm over a stem length of 10 cm. Color on adult stems:            near Greyed-Orange Group 167C.-   Leaves:    -   -   Overall appearance.—Dense dark green.        -   Leaflets.—Shape: generally oval. Number: 3, and most often 5            and 7.        -   Size.—Terminal leaflets commonly are approximately 6.4 cm in            length on average and approximately 4 cm in width on            average. Apex: generally cuspidate. Base: rounded.            Serration: slightly denticulate, small and single. Texture:            firm, and leathery, and glossy on the upper surface. Color            (young foliage): near Green Group 137B on the upper surface,            and near Yellow-Green Group 146B on the under surface. Color            (adult foliage): near Green Group 139A on the upper surface,            and near Green Group 137B on the under surface.        -   Petiole.—Length: commonly approximately 3.8 cm on average.            Texture: slightly glandular on the upper surface and            commonly with a few prickles on the under surface. Color:            near Green Group 137B on the upper surface, and near Green            Group 137C on the under surface.        -   Rachis.—Color: near Green Group 137C on the upper surface,            and near Yellow-Green Group 137C on the under surface.        -   Stipules.—General appearance: adnate, pectinate, and rather            broad. Size: commonly approximately 2.1 cm in length on            average, and approximately 6 mm in width on average. Color:            near Green Group 137B on the upper surface, and near Green            Group 137C on the under surface.-   Inflorescence:    -   -   Number of flowers.—Commonly approximately 2 to 5 blossoms            per stem.        -   Buds.—Shape: generally conical and medium in size. Length:            approximately 2.7 cm on average. Width: approximately 1.9 cm            at the widest point on average. Color: as the calyx breaks:            on the upper surface near Yellow Group 13B and margined with            Orange-Red Group 30C and 30D, and on the under surface near            Yellow Group 13B margined with near Orange-Red Group 30C and            30D.        -   Flower.—Diameter: approximately 10 to 11 cm on average when            fully open. Shape: cup-shaped. Color (in course of opening):            Upper side: near Yellow Group 13B margined with near            Orange-Red Group 30D. Under side: near Yellow-Orange Group            15C margined with near Orange-Red Group 30B. Color (when            open): Upper side: near Yellow Group 12C and more or less            margined and suffused with Orange Group 28D. Under side:            near Yellow Group 12C and very slightly suffused with near            Orange Group 28D. Fragrance: none. Petal number: commonly            approximately 22 to 26 on average under normal growing            conditions. Petal shape: commonly display a rounded tip and            an obtuse base. Petal arrangement: imbricated and commonly            without petaloids. Petal texture: firm and leathery. Petal            length: commonly approximately 5.5 cm on average. Petal            width: commonly approximately 4 cm on average. Petal drop:            good with the petals commonly detaching cleanly before            drying. Stamen number: commonly approximately 108 on            average. Anthers: arranged regularly around the styles,            commonly approximately 2 mm in size on average, and near            Yellow Group 13C in coloration. Filaments: commonly            approximately 1.1 to 1.5 cm in length on average, and near            Yellow Group 13A in coloration. Pistils: commonly            approximately 76 on average. Styles: commonly approximately            6 mm in size on average, and near Yellow Group 4D in            coloration. Stigmas: commonly approximately 2 mm in size and            near Orange-Red Group 34B in coloration.        -   Receptacle.—Length: commonly approximately 9 mm on average.            Width: commonly approximately 12 mm on average at widest            point. Shape: funnel-shaped. Texture: smooth. Color: near            Yellow-Green Group 146D.        -   Sepals.—Length: commonly approximately 3.2 cm on average.            Width: commonly approximately 1 cm on average at the widest            point. Shape: longish and narrow and commonly upright upon            initial opening. Texture: tomentose on the upper surface and            smooth on the under surface. Color: commonly near            Yellow-Green Group 147D on the upper surface and near            Yellow-Green Group 146D on the under surface.        -   Peduncle.—Length: commonly approximately 6 cm on average.            Width: commonly approximately 7 mm on average. Texture:            smooth. Color: near Yellow-Green Group 146D.-   Development:    -   -   Vegetation.—Very strong.        -   Blooming.—Early season, very abundant and substantially            continuous.        -   Tolerance to diseases.—Very good, particularly with respect            to black spot.

I claim:
 1. A new and distinct Grandiflora rose plant characterized bythe following characteristics: (a) forms very strong vegetation, (b)exhibits a bushy growth habit with very dense dark green foliage havinga glossy upper surface, (c) abundantly and substantially continuouslyforms attractive double cup-shaped yellow blossoms, (d) displays verygood tolerance to disease, and (e) is well suited for providingdistinctive attractive ornamentation in the landscape; substantially asshown and described.